My beloved Hartke has finally coughed out. It's been a great amp for many years so I am now a sad boy. It started to cut out intermittently and it seemed like a loose output cable/jack connection at my bass. When I wiggled the output cable at the jack it came back to life for a short while. I did this back and forth thinking it was my output jack or a bad 1/4 inch cable. Eventually it quit and wouldn't come back. After a bit of struggling the amp began to just fart out and distort the speakers really badly, producing almost no volume. It's definitely the amp, when I plopped my Hartke 2000 onto my stack it sounded like it always has, fantastic. I had it serviced maybe six months prior by a tech with decades of experience. He cleaned up various electrical connections, replaced the input jack and threw a new tube in. basic maintenance stuff. Any light bulb ideas as to where to start? I'm not super savvy with amp electronics so I'm in need of some tb wisdom here... Thanks in advance!